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STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 13,397.3 $ 11,112.6
Other comprehensive income 3.1 54.3
Ending balance 14,046.4 11,294.2
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (12.2) (162.5)
Other comprehensive income (loss) before reclassifications 2.0 55.4
Amounts reclassified from accumulated other comprehensive income (loss) 1.5 (1.4)
Other comprehensive income 3.5 54.0
Ending balance (8.7) (108.5)
Gains (Losses) on Hedge Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (2.5) (2.9)
Other comprehensive income (loss) before reclassifications 4.1 3.7
Amounts reclassified from accumulated other comprehensive income (loss) 1.5 (1.2)
Other comprehensive income 5.6 2.5
Ending balance 3.1 (0.4)
Unrealized Gains (Losses) on Available-for-Sale Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (29.7) (154.2)
Other comprehensive income (loss) before reclassifications (4.3) 37.8
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 (0.2)
Other comprehensive income (4.2) 37.6
Ending balance (33.9) (116.6)
Foreign Currency Translation Gains (Losses)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 19.4 (6.6)
Other comprehensive income (loss) before reclassifications 2.2 13.9
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Other comprehensive income 2.2 13.9
Ending balance 21.6 7.3
Employee Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 0.6 1.2
Other comprehensive income (loss) before reclassifications 0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss) (0.1) 0.0
Other comprehensive income (0.1) 0.0
Ending balance $ 0.5 $ 1.2